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Interceptor121

Member Since 25 Jun 2011
Offline Last Active Today, 07:29 AM
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Topics I've Started

UHD 'Premium' Specifications

Yesterday, 12:26 PM

Just when we thought it was over there is now a new specification for premium UHD content launched buy some of the manufacturers and media companies

 

The most interesting features are richer colours and HDR contract on top of the UHD resolution

 

http://interceptor12...ion-mean-to-4k/

 

I have some doubt all this stuff will ever pick up to be frank as on my Tv set none of the 4K clips I am playing looks particularly amazing compared to a good bluray rip


UHM Premium Specifications

Yesterday, 12:22 PM

deleted


Workflow for 4K 100 mbps 8 bit files

27 December 2015 - 03:30 AM

I have done a few tests to ascertain if there is a better workflow for 4K files are produced by Sony and Panasonic camera
 
I have tried converting to Prores 422 and 422 HQ and I don't see any difference of any sort. Prores 422 is 492 mbps for my 25 fps files so around 5x the size and Prores 422 HQ is 737 mbps
It looks like the H264 conversion is not so strong to warrant the 422 HQ conversion as there is no difference with 422.
 
However the same files at HD seem to benefit from conversion to Prores 42 HQ from Sony XAVC 50 mbps
 
What I am getting at is that the new iMovie has Prores 422 as an output format so I am thinking that it is possible to process those files with decent result with the following steps:
 
  • Import to iMovie directly from SD card
  • Editing (no or minimal colour correction as the files are 8 bit)
  • Export to Prores 422
  • Encode to HEVC with handbrake
 
At the end of this process I get decent quality that looks very similar to the footage as it was captures with files that are around 25 mbps or 3 Mb/s so 3 minutes work out at 480 Mb which is not too bad
 
Unfortunately Youtube does not accept HEVC and Vp9 crashes when I try to create similar files. I have converted the same files to H264 high profile to youtube specified 35-45 Mbps and they look gross. I think this explains why many clips in youtube at 4K look not so great and full or artefacts

Lenses for Puerto Galera Trip

29 November 2015 - 02:53 AM

Am going to Puerto Galera at the end of February for one week
I have a Panasonic GX7 and am planning to dive mostly with the Olympus 60mm.
I will also be taking a Sony RX100 IV with wet lenses for video
I also have the 14-42mm kit lens, the Panasonic 7-14mm with wide angle port and the 8mm fisheye however I wonder if I should even bother taking those lenses with me?
Any help appreciated

Encoding 4K videos

28 November 2015 - 03:47 AM

I have been playing recently with both the Panasonic LX100 and the Sony RX100 IV

Both cameras shoot 8 bit 100 Mbps H264 video files. The panasonic codec appears more advanced but the video settings are pretty basic so most of the detail is lost.

Anyway I uploaded some sample files converted to prores and then coded them in H265, the resulting files are pretty small and have outstanding quality at 25 Mbps when I play them on Minix.

However when I tried to upload to youtube I got an error as H265/HEVC is not supported.

Has anyone found a (mac) application that can encode VP9? No product that I have supports it and encoding back to H264 means loosing lots of information from 100 -> 32 mbps?

It seems like the whole 4K situation is pretty undeveloped and the resulting files in 1080p look worse than my old HD encodes??